num = 3
def fun():
    num = 5
    print("函数内局部变量num的值：", num)
fun()
print("函数外全局变量num的值：", num)


num = 5
def fun():
    global num
    num += 1
    print("函数内num的值：", num)
fun()
print("函数外num的值：", num)


def outer():
    num = 1
    def inner():
        nonlocal num
        num = 2
        print("inner函数中num的值：",num)
    inner()
    print("outer函数中num的值：",num)
outer()


stu = [{'num': '201801', 'name': '王五', 'score': 89},
    {'num': '201802', 'name': '刘军', 'score': 95},
    {'num': '201803', 'name': '李梦', 'score': 85}]
stu.sort(key=lambda x: x['score'])
for s in stu:
    print('学号:',s['num'],'姓名：',s['num'],'成绩:',s['score'])
